@misc{indiciaef9be982288d5,
  title = {Aeromagnetic map of the International Falls 1 degree x 2 degree Quadrangle, Minnesota and Ontario},
  author = {Robert E. Bracken and Richard H. Godson},
  year = {1987},
  doi = {10.3133/ofr87620},
  url = {https://pubs.usgs.gov/publication/ofr87620},
  note = {Source identifier: ofr87620}
}